Old books are kept in that part of the library. 

=> They keep old books in that part of the library.

2 Did the researchers find any evidence of writing ?

=> Was any evidence of writing found by the researchers?

3 They show an educational documentary every month .

=> An educational documentary is shown every month.

4 Have the technician taught him to use the computer yet ?

=>Has he been taught to use the computer by the technician yet?

5 I wasn't told answers by my close friend .

=> My close friend didn't tell me answers.